introduction about ns2 and installation in unix and the extension of Ns

介绍如何对NS2进行多信道多接口扩展，并支持动态信道分配。-NS2 introduce how to carry out the expansion of multi-channel multi-interface, and supports dynamic channel allocation.

Gnusim使用说明，该论文介绍了ns2之上扩展的Gnusim的结构，扩展方法，用于P2P仿真-Gnusim instructions for use, the paper describes the ns2 extension Gnusim on the structure of extension methods for P2P simulation